Vanadium micro-alloyed 1300 Mpa-grade high-strength hot-rolled steel plate and production method of cold-rolled dual-phase steel plate

The technology of a hot-rolled steel sheet and a production method is applied in the field of preparation of a dual-phase steel sheet, which can solve the problems of insufficient strength of the dual-phase steel sheet, and achieve the effects of improving strength, good elongation, and high production efficiency.

Active Publication Date: 2018-09-04
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem of insufficient strength of dual-phase steel plates prepared by existing methods, the present invention provides a production method of vanadium microalloyed 1300MPa high-strength hot-rolled steel plates and cold-rolled dual-phase steel plates

Method used

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  • Vanadium micro-alloyed 1300 Mpa-grade high-strength hot-rolled steel plate and production method of cold-rolled dual-phase steel plate
  • Vanadium micro-alloyed 1300 Mpa-grade high-strength hot-rolled steel plate and production method of cold-rolled dual-phase steel plate
  • Vanadium micro-alloyed 1300 Mpa-grade high-strength hot-rolled steel plate and production method of cold-rolled dual-phase steel plate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Chemical composition (wt%) of table 1 invention steel

[0036] Element

C

mn

Al

V

Si

P

S

A

0.10

1.84

0.080

0.08

0.20

<0.005

<0.005

B

0.16

2.62

0.053

0.15

0.33

<0.005

<0.005

C

0.25

4.13

0.120

0.35

0.80

<0.005

[0037] The test in this example adopts the chemical composition shown in Table 1. After smelting, it is cast into an ingot, hot-forged into a slab with a thickness of 50 mm, heated to 1200 ° C for 3 hours, and then hot-rolled to about 4.7 mm by a pilot single-stand rolling mill to obtain a hot Rolled products, the final rolling temperature is about 850°C, and then divided into 1 and 2 coiling methods according to the cooling process and coiling temperature, which are marked as 1 group and 2 groups respectively. , in which group 1 is rapidly cooled to about 530°C at a cooling rate of about 5°C / s after final rolling, and then cooled to 150°C at a rat...

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Abstract

The invention discloses a vanadium micro-alloyed 1300 Mpa-grade high-strength hot-rolled steel plate and a production method of a cold-rolled dual-phase steel plate. The technical problem that the strength of the double-phase steel plate prepared by the existing method is insufficient is solved. According to the technical scheme, the 1300 Mpa-grade high-strength hot-rolled steel plate is formed through control cooling and through steel smelting and solidification, casting blank or hot continuous rolling after ingot casting cogging, after the hot continuous rolling is carried out at a certain temperature in a coiled mode, acid washing and room temperature cold rolling are carried out to 1-3 mm thick, then instant quenching is carried out at a certain temperature short-time heat preservationtime in a 720-780 DEG C two-phase region, and the vanadium micro-alloyed 1300 Mpa-grade high-strength dual-phase cold-rolled steel plate is prepared. According to the preparation process, nano-vanadium carbide particle precipitation strengthening and martensite phase change strengthening are combined, the strength of the existing dual-phase steel is remarkably improved, and meanwhile, the production efficiency is also guaranteed.

Description

technical field [0001] The invention relates to a preparation method of a dual-phase steel plate, in particular to a production method of a vanadium microalloyed 1300MPa grade high-strength hot-rolled steel plate and a cold-rolled dual-phase steel plate. Background technique [0002] High-strength and high-plastic materials have always been pursued by material workers. At present, the automotive steel industry is facing the need to improve product performance to ensure safety. At the same time, it requires the development of lightweight body and new technology to reduce energy consumption standards and reduce pollutant emissions. Meet the corresponding social norms of energy conservation and environmental protection. In recent years, the development of dual-phase (martensitic + ferrite) steels has met the performance requirements of automotive steels at low cost and has been widely used. [0003] For a long time, the mechanical properties of dual-phase steel mainly rely on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/06C22C38/02C22C38/12C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0236C21D8/0273C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 罗海文刘峰张敬彬
Owner NORTHWESTERN POLYTECHNICAL UNIV
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